<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{path:'/home'}">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>
            <!-- 表格区域 -->
            <tree-table :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" :show-index="true" index-text="#" border :show-row-hover="false">
                <template slot="isok" slot-scope="scope">
                    <i class="el-icon-success" v-if="scope.row.cat_deleted==false"></i>
                    <i class="el-icon-error" v-else></i>
                </template>
                <template slot="order" slot-scope="scope">
                    <el-tag size="mini" v-if="scope.row.cat_level==0">一级</el-tag>
                    <el-tag size="mini" type="success" v-else-if="scope.row.cat_level==1">二级</el-tag>
                    <el-tag size="mini" type="warning" v-else>三级</el-tag>
                </template>
                <template slot="opt" slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                </template>
            </tree-table>
            <!-- 分页区域 -->
            <el-pagination class="treeTable" @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum" :page-sizes="[3,5,10,15]" :page-size="queryInfo.pagesize" layout="total,prev,pager,next,jumper" :total="total"></el-pagination>
        </el-card>
        <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
            <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
                <el-form-item label="分类名称" prop="cat_name">
                    <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类" style="position:relative;">
                    <el-cascader expand-trigger="hover" :options="parentCateList" v-model="selectedKeys" @change="parentCateChanged" :props="cascaderProps" clearable change-on-select></el-cascader>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible=false">取消</el-button>
                <el-button type="primary" @click="addCate">确定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    created(){
        this.getCateList()
    },
  data () {
    return {
        //查询条件
        queryInfo:{
            type:3,
            pagenum:1,
            pagesize:5
        },
        //商品分类的数据列表,默认为空
        catelist:[],
        total:0,
        columns:[
            {
                label:'分类名称',
                prop:'cat_name'
            },
            {
                label:'是否有效',
                //表示将当前列定义为模板列
                type:'template',
                //表示当前这一列使用模板的名称
                template:'isok'
            },
            {
                label:'排序',
                //表示将当前定义为模板
                type:'template',
                //表示当前这一列使用模板的名称
                template:'order'
            },
            {
                label:'操作',
                type:'template',
                template:'opt'
            }
        ],
        addCateDialogVisible:false,
        addCateForm:{
            //将要添加的分类的名称
            cat_name:'',
            //父级分类的id
            cat_pid:0,
            //分类的等级，默认要添加的是1级分类
            cat_level:0
        },
        addCateFormRules:{
            cat_name:[
                {required:true,message:'请输入分类名称',trigger:'blur'}
            ]
        },
        parentCateList:[],
        //选中的父级分类的id数组
        selectedKeys:[],
        //指定级联选择器的配置对象
        cascaderProps:{
            value:'cat_id',
            label:'cat_name',
            children:'children'
        },
    };
  },
    methods:{
        //获取商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories',{params:this.queryInfo})
            if(res.meta.status != 200){
                return this.$message.error('获取商品分类失败')
            }
            //把数据列表，赋值给catelist
            this.catelist = res.data.result 
            //为总条数赋值
            this.total = res.data.total 
        },
        //监听pageSize的变化
        handleSizeChange(newSize){
            this.queryInfo.pagesize = newSize 
            this.getCateList()
        },
        //监听pagenum改变
        handleCurrentChange(newPage){
            this.queryInfo.pagenum = newPage 
            this.getCateList()
        },
        showAddCateDialog(){
            this.getParentCateList()
            this.addCateDialogVisible = true 
        },
        //获取父类的数据列表
        async getParentCateList(){
            const {data:res} = await this.$http.get('categories',{params:{type:2}})
            if(res.meta.status != 200){
                return this.$message.error('获取父级分类数据失败!')
            }
            // console.log(res.data)
            this.parentCateList = res.data
        },
        parentCateChanged(){
            // console.log(this.selectedKeys)
            // 如果selectedKeys数组中的length大于0，证明选中的父级分类 反之，就说明没有选择任何父级分类
            if(this.selectedKeys.length >0 ){
                //父级分类的id
                this.addCateForm.cat_id = this.selectedKeys[this.selectedKeys.length - 1]
                //为当前分类的等价赋值
                this.addCateForm.cat_level = this.selectedKeys.length 
                return 
            }else{
                // 父级分类的id
                this.addCateForm.cat_pid = 0
                //为当前分类的等级赋值
                this.addCateForm.cat_level = 0
            }
        },
        addCate(){
            // console.log(this.addCateForm)
            this.$refs.addCateFormRef.validate(async valid=>{
                if(!valid)return 
                const {data:res} = await this.$http.post('categories',this.addCateForm)
                if(res.meta.status != 201){
                    return this.$message.error('添加分类失败')
                }
                this.$message.success('添加分类成功')
                this.getCateList()
                this.addCateDialogVisible = false 
            })
        },
        //监听对话框的关闭事件，重置表单数据
        addCateDialogClosed(){
            console.log(1)
            this.$refs.addCateFormRef.resetFields()
            this.selectedKeys = []
            this.addCateForm.cat_level = 0
            this.addCateForm.cat_pid = 0
        }
    },
}
</script>
<style lang='less' scoped>
    .treeTable{
        margin-top: 15px;
    }
    .el-cascader{
        width:100%;
    }
</style>